powerpc/85xx: add fdt_fixup_dma3

On some SoC(e.g. T2080/T4240) the 3rd DMA is not functional if SRIO2 is
chosen. we add fdt_fixup_dma3() to disable the 3rd DMA if SRIO2 is chosen.

Signed-off-by: Shengzhou Liu <Shengzhou.Liu@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
1 file changed